The data source is not embedded within a (parent) data source. (PU43 10.0.19 error) in D365FO

 The data source is not embedded within a (parent) data source. 

Write COC for FORM DS extension method

(In my case, SalesTable (Form) & SalesLine_IN (DS)). Even IN region localization not enabled.

Note: This has been fixed by MS as part of PU43 (10.0.19) + QU

1. Code fix solution (Temporary)

// Temporary fix for "The data source is not embedded within a (parent) data source." Error while opening All Sales order form after upgrade PU43 (10.0.19)

void init()

{

next init();

this.insertIfEmpty(false);

this.allowCreate(false);

}

2. Workaround solution (Temporary)

   //Changed personalize view to Standard view